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Fabio SebastianoFS

Fabio Sebastiano

Senior Backend Architect | FastAPI, Microservices

€550/day
Milan, IT
15+ years

Average response time: 1 hour

About Fabio


I design and build production-grade backend systems and secure APIs for companies that need software to scale — not fragile prototypes.

With 15+ years of experience, I help startups, SMEs, and enterprises turn complex requirements into robust backend architectures, AI-powered platforms, and cloud-native systems ready for real-world usage.

My core focus is backend architecture and system design: FastAPI (Python) for high-performance services, microservices-based architectures, secure APIs (JWT/ACL), and PostgreSQL-backed data models built to last.

I also work on advanced AI integration, embedding LLMs (OpenAI GPT, Claude, Whisper) into real products through structured backends, persistent memory, RAG pipelines, and controlled orchestration — not demos or one-off chatbots.

I typically work on:
- Scalable backend systems and APIs (FastAPI, PostgreSQL)
- Microservices and system architecture
- AI-driven platforms and automation (LLMs, RAG, data pipelines)
- Cloud-native deployment and scalability (AWS, GCP)

My approach is pragmatic and architecture-first: clear boundaries, clean code, detailed documentation, and solutions designed to remain maintainable over time.

If you need a fast MVP to validate an idea, I’m probably not the right fit.
If you need a backend or AI system that must hold up in production, we should talk.

Available for remote projects or on-site in Milan or Europe.
Let’s discuss your technical stack and architectural constraints.

Core expertise: FastAPI backend development, microservices architecture, API design, and AI backend systems.
  • Italian

    Native or bilingual

  • English

    Native or bilingual

  • Russian

    Fluent

  • German

    Conversational

  • French

    Conversational

  • Spanish

    Conversational

Can work on-site
Milan (up to 50km)

Experience

  • VerbanoTechnologies
    Senior Backend Architect & Solution Architect
    DIGITAL AND IT
    September 2009 - Today (16 years and 11 months)
    Milan, Italy
    I design and build scalable backend systems and APIs using Python (FastAPI) and cloud platforms.

    My expertise focuses on backend architecture, microservices, secure API design (JWT/ACL), and PostgreSQL-based data models, with production-ready deployments for startups and SMEs.

    I also work on advanced AI integration, embedding LLMs (OpenAI GPT, Claude) into real software systems through structured backends and controlled automation, not demos.

    I have delivered both modular and full-stack projects, always prioritizing clean code, technical documentation, long-term maintainability, and reliable production support.
    Python AI Integration (GPT, Claude) FastAPI Microservices Architecture IT Architecture

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Education

  • BA (Hons) in Philosophy, Politics and Economics (PPE)
    University of Oxford
    1996
    I hold a BA (Hons) in Philosophy, Politics and Economics (PPE) from the University of Oxford, which provided me with a multidisciplinary approach to problem-solving, strategic thinking, and data analysis. Before university, I completed a technical diploma in Electronics, giving me a solid foundation in technology and applied sciences. This combination of business insight and technical skills has enabled me to successfully bridge the gap between management and IT throughout my career.

Certifications

  • Enterprise Solution Architecture Masterclass
    European Institute of Technology & Innovation
    2015
    Solution architecture, software design patterns, project leadership, systems integration
  • Advanced AI Applications in Business
    International Business & Technology Academy
    2022
    Artificial intelligence, generative AI, business automation, AI strategy

Skill set

Categories